"the function return value 'self inductance' might be unset"

hye, this is my codes,

function [ Selfinductance ] = Inductance(D_out,D_in,p)

u= pi*4*10.^-7;

y= 4*pi*p.^2;

X= (u*D_out.^3)/y;

a = D_in/ D_out;

B = (1 - a);

b = (1 + a);

m = X* (1-a.^2)*(1-a);

n = log(b/B) + (0.2235*(B/b))+ 0.726;

L = m*n

end

this codes is working perfectly but i got warning "the function return value 'self inductance' might be unset" and when i tried to call this function in another function, 

function [ qfactor] = qfactor(D_out,D_in,p) 
f= 0:8;

for i = 0:8

      L= Inductance(D_out,D_in,p);

      Q(i+1)= f(i+1)*L

end

end

I got this,

L =

     4.5579e-06

Error in Inductance (line 3)
u= pi*4*10.^-7;

Output argument "Selfinductance" (and maybe others) not assigned during call to "C:\Users\.......

why this happened and how can i fix this?

Answer 1

[Star Strider]

Perhaps you intend:

Selfinductance = m*n;

or to return ‘L’ as the output.

[rose wright]

it working now! thanks for helping

[Star Strider]

As always, my pleasure!